htb: fix values in opt dump

in htb_change_class() cl->buffer and cl->buffer are stored in ns.
So in dump, convert them back to psched ticks.

Note this was introduced by:
commit 56b765b7
    htb: improved accuracy at high rates

Please consider this for -net/-stable.
Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sched/sch_htb.c

@@ -1135,9 +1135,9 @@ static int htb_dump_class(struct Qdisc *sch, unsigned long arg,
 	memset(&opt, 0, sizeof(opt));
 
 	opt.rate.rate = cl->rate.rate_bps >> 3;
-	opt.buffer = cl->buffer;
+	opt.buffer = PSCHED_NS2TICKS(cl->buffer);
 	opt.ceil.rate = cl->ceil.rate_bps >> 3;
-	opt.cbuffer = cl->cbuffer;
+	opt.cbuffer = PSCHED_NS2TICKS(cl->cbuffer);
 	opt.quantum = cl->quantum;
 	opt.prio = cl->prio;
 	opt.level = cl->level;